Distance=speed×time. For the first part of the journey distance will be d=50mph×2hrs=100miles.
Total time taken for second part of the journey=60200=3.33hrs.
We know that =Averagespeed=totaltimetakentotaldistance. Therefore,
Totaldistance=100miles+200miles=300miles.
Totaltimetaken=2hrs+3.3hrs=5.3hrs.
Thus,Averagespeed=5.3300=56.6mph
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